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Surprpart Far

sinclair
7281 - spectres - 81
and

QOLUNE ?
piso sinciair

1066 - 1560 - 2663

computers

HAPPY
EASTER

Welcome to anather-
issue of Timelinez,
At the last P.U.C.

VIEW FROM
RAN-TOP meetings an obser—
vatian was made

concerning the printing af Sinc—
Link within this publication. It
seems that due to the size and
bulk of the text files Cin other
words: a lot of kbutes af text
eccupies toc manu pases® that
conmeisct of SincLink, in affect;
‘comsume® most aqvatliahble room
Where articles and projects
could be printed. The result of
this happened with the January
and Februaryu i989 issues. Other
observations made were concern—
ima the ‘size of text and the
unorthodaxed format desian’.
may help for those tao look at
the format as an cautline. Yes,
mares chamaes pave occured im

the paci for SincLink, however s
the changes fave been for the
better. The concern aver the
text size something Like be-
ina stuck between a rock and a
Richt hs dust imagine takine the
SinmcLink section of the February
issue and expanding the text to
Timelinez format. That means 4
columns comverted ta = aver 3
pages. The result would give you
up to and maybe over 12 pages.
And that's for an 8 i-Z2 x il
page. SincLink is nmormatlyu past—
ed up on an & i/f2 id page. Sa
you can see all the work that ts
involved in creating SincLink.
With all this saids and starting
with this issue, StincLink sub—
scribers will receive their pub—
Lication within a Timelinez
cover. If you have mot paid for
the above, you will anlu receive
Timelinez. For those who have
Faid for both will receive both.
See Timelinez Information for
the addresses tao both publica-—
tions if imterested in subscrib—
img to both.

Ti

i=

x

The Editors....

me. af
ey 22
get
a Ps 2
, :
es
| es | Ld

ISSUE &3

1989 $2.58

\_TIMEX/sinclair User Croup Nevs—Magazine—~

MARCH

SR ee es.

NOGRAT

ME

Thank uou very much for your

interest in the Sinclair Horth
America Users Group. We apala—
gize that we were unable toa re-—
turn any inquiries sooner, but
as this has become a ‘one man
show’ we were unable to answer
gall correspondence in a@ timely
manner. Thank you For your Ppa
tience. With this correspondence
we would Like ta bring you up te
date on the latest activities of
& .NH.U.C.

So what have we been daing all
this time? Plenmtyu!! Firstilus we
drafted a charter that was de—-
eianed toa allow for most provi-
sions including expansion. This
Wae a veru time comcuming task.
The Charter nas been sent ta tne
Florida State Secretary af State
and wast approved om December 27;
19S. ALL funds up to mow have
been held and were deposited
imto a checking account on Dec.
31; 1986.

ie have. with the help of the
Libraru Committee, established a
format to work the Pubtic Domain
Software Library. We currently
hove cet up Librarians for the
following machines and formats:

Head Librarian.......Frank Davis
Assist. Head Librarian..Tim Word

2H-S1, TS-1666, TS-1566
Cassette, Larken 00S

Tim Ward, Tony Willing

Spectrum, TS-2ZH66

Cassette co. 2 Sees ee ee Cank Davis
A&I Microdrive and
Wafadrive.......:.-Andy Hradesky
Frank Davis
Aerco....e202e2e222Fete Fischer
Learken — To Be Announced
Gliger 00S......-Paul Holmorens
Wittlie Jones,
Cary Lessenberry
Portugal TNH -— To Be Announced

‘|| TIMELINEZ nevs—magazine is published
| TIMEXsinclair pand ts 8 Copyright 1987 bu American
iMicroa Systems, Sam Joce, CA 9Sizi1.
| user group il TIMELINES may be freely copied for non-—
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bas Heus- Magazine | whole or in part for commercial means
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is prohibited by law.

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CHANCE OF ADDRESS: Please notify us by
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| Keep the communication open and let us
iknow your interests.

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NOTICE: Contributors to TIMELIBEZ ore ——. t of Americon Micra Systems |
and opinions expressed in the contents of this publication are not necessarily |
those of the ene staff or its advertisers. Aimericarn Hicro Systems
will not be held liable for any damage or consequences resulting from instru- |

i

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| DESK-TOP PUBLISHING |
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ee i ROQGZ ine’ e confent, It is recommended that myone attespting to modify their

| clions, assertions of faces revieu of products or companies provided in the

computer or constructing an electrical preject should seek help from sore

TIMELIRE? ere eS ee eee

IKFORMATIOR

peers jee a a a

Managing Editer: Andy Hradesky Nake all HeL Exchange
€a—Edttors: correspondence ta:
TYS-PUG: George Nockridse
T/7S-SUUs Bill Miller—stncl ink TIMEL INEZ
ST-EBZUG: chm Ezike PsOu- Box iste
TCU TY’S_SIG: Mark Wahl Pacifica, CA 34644
TAS-BAN.Inc: George Featherman ATTN: Geeorse Moackridge

fidvertising: Back issues of TINE-
Gil Blasingame LINE?, 7/33 thru 12°87
George Mockridae Comtact Bitl Miller

at:

Exchange:
T/“S-PUG: Georse MNockridge SincLink
T“S-SUU: Bill Miller «SLIk> 6675 Clifford Drive
TAS-BAMN: George Featherman Cupertino, CA 95614

fidvertising Scheduie: Iesues 1°85 -— present,

Full Page: . $46.88 contact your editor at
Half Page: $26.46 American Micra.

if4 Page: . - & &.88
if“& Page: - - $5.66 The PDSE Library is
= = now available ta all;
imerican Micra Systems covering T/Sigga—-i50G,
2175 fbere Ed. #262 T’S 2668, Spectrum and
San Jose, CH 95121 the GL.
(498) 276-9738 Contact American Micre
CompuServe IB# 72267 ,3572 for further details.

CompuServe IB% 72166, 2011

IMELINEZ | vette

$.H.U.6. COHTINUEDR....

GARE ate bhecers
Famex SPOOS -— To Be Announced

q Quantum Leap cOL>
Microdrive

Ploppu Btee cos 6 seles Tim Stoddard

Softucare and
Eprom — To Be Announced

We are currently assessing
wheat programs qualifu for Public
Domain and we are gathering pro
orams at this time. We cannat
Sive am accurate number of pro-
srams available, but we have
conservatively estimated ta have
on hand approximately S54 Spec—
trum and TS2665 programs and 2746
esaci and TSiGG6 programs as of
January 1, 1989. We have been
qgdvised that several Commercial

Programs have been released into |;
the Public Oomain. GQnce all the
details are arranged, an an-—

noumcement will be made.

Wie have alco been truing ta
Put together a Publication
Committee to determine how our
Magazine will loci:
comtents. Several of
dents expressed interest in
writing articles, sa we should
have several first time uriters
With some mew applications.

=. . —.
amd itts

At this time cur membership
rates are £12.66 for individual
and $15.86 for User's Croup. We
are im the process of determin—
img elections. The process is
ongoing through the manth of
March and announcements of
officers should be made oan
25) 1989.

aes

April

The current officers are:

Mel Hathanson — Acting
Chairpersons
Pro-Tem.
Foul Hotmoren —- Acting Vice-—
Chairpersons
Pro-Ten.
‘JC’ Cushran — Acting
Treasurer ;
Pro-Tem.

John

The offices that will be voted
om consist af:

let Vice-President
2nd Vice—-Precident

President
Secretary
Treasurer

tie ele! tie Stocelcrcit

cur respon |

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i Ficult enough

iwhyu a window

; useful.
i Sone
| stores

We hope that this press
release will ansver most
questions. We alsa anticipate
your joining the arganization.
There is samethinga special about
a persam willing to take a
chance on an idea that hes noth—
ing immediately tangible ta be
had for their hard earned money.
It takes a@ person with visions
courage, and some money that
they don't need right auay!
Ideas with as much scope as the
one we are attempting are dif-
to pull of fF with-
out individuals such as the
Charter Members and without your
help, I really don’t think this
much could have been accomplish—
ed. Be proud — there are not
many of you cut there. We Thank

you.
Mel Nathanson
i$.N.U.E6.
f7215 Arbordale Or.

Port FRicheu,;

ie
S466S

Sas Sr eS
SCREER <peertp
BY LT one EER*R é

~Y SHENSON X

The follouina prosram al lous

the user to peek the screen

and find cut what color a@ par—
ticular pixel’ is. The program
works amlu for the Hiach Fes.
mode t4 colors. I have tried
to make it work for Lou Fec.
mode, but have had ma tuck at
all.

There is one thing to remem—
ber when using the program. If
you use a block command for a
Particular uindou, the block
appears relative to the windou
The SCREEN PEEK'F dees mot work
relative to any window. This is
the size of the
display is defined.

Hope you can find the program
At the least it gives
imsicght as to how the GL
the screen.

1@6
118
126
136
146

REMark
REMNark
WINDOW
CLS

x=168 :

SCREEH PEEK'R
bu LT Timothy Suenson
512 ,256,6,6

y=1235

IMELIRE?

SCREEH PEEE‘R CONTINUED... .

1i5@ BLOCK 1,1;x;u;8
i6@ red=@ : green=-&
17 pix=1sierst+ Cy#1 289+ CINT
tx“S> *2>
ifG@ peeki=PEEK tpix>
19a im=peeki =: dectohin
266 peekit=outt
21G@ peek2=PEEK (pixti>
2208 im=peek2 +: dectcbin
236 peekZt=outt
24G bit=<tx MOD &>+i
250 green=peekif tbit>
266 red=peekZ74 tbit>
276 IF red ANDO green THEH PRINT
“WHITE”
2780@ IF WOTtred> ANDO NOT Coreen.
THEW PRINT “BLACK”
296 IF red AND HOTtgreen> THEN
PRIHT “RED”
20@@ IF NOTtred>? AHO oareen THEN
PRINT “GREEN”
31@ RENark #4#44S EE EREEEE
370 DERFine PROCedure dectobin
338 outt=""
346 FOR z=7 to @ STEP -1
358 LET temp=ine’(27=
368 IF temp>=1 THEN
378 outt=outte"1"
3ea in=in—-tINT ctemp> Ha 7=5
394 ELSE
468 outh=outte."s"
418 EWD IF
4270 WEXMT =
436 ENWD DEF ine
ae ghee ss ee eet eS Sa
t SS
Lee 0
|
einer | EERE
f.. 1 ft
i t i
E | ———J— 0
OAC pees
{@; i
It is impocsible ta make any

programs foolproof because fools
are soa ingenioqus.
to recurses

To iterate is human:

devine.

just Like
if you're

octal is
decimals
fingers.

Counting in
counting in
missing tua

just Like
if you're

binary is
decimals

Coumtina in
counmting in
att thumbe.
CS

Don't sweat it’s onmly ones

and zeros.

To err is human, to really foul—
up requires a computer.

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Dear Fellow TSers;s

in

im your Public

I use
& the 2868
and I am currently truing ta set
up a Softuare Conmmection of

Hi! I am interested
Participating
Domain Suapping Program.
the TS-16@6, 1506,

Buying and Selling TS SW cand

some HLS .

loam looking forward ta being
im contact with several TSUCG's.
Mu address is: Chartes Ridauay
2816 Chestnut
San Angetas TH
769R1
#°915>

Mu Phone a42-F7564

Thank you —

Tear Sir or Nadames

I would like as much information
as possible on supplies, publi-
cations, newsletters, softucres
etc., available for mu TIMEX
sinclair 2481-1886 computer.

Tf you have anu information at
ail, please help me bu writing a
feu lines. Thank you.

Futh M. Engel
14699 HE 18th Avenue ‘tél
NH. Miami, Florida 33181

With regard to the attached
label. Whu did you decide to
place “Mrs” in front of my name?
Have problems with “MNs"? Also
the name of the toun ends with
an “o"™ not an "a". Kindly cor
rect the mailing label. What's
the telephone number to Kevin
Leung's BES?

Ed. note: Your label is correct—
ed, I guess I was viewing you

optimistically. Kevin's BBS # is
C4150 753-5265. My apologies for
mot printing it in Jan."s issue.

-. e

IMEL TNE Zoe

TS CHAOS

CHAOS is everywhere-the stars, weather,
columns of smoke, biology, noise on a
phone line. It is a new math. It can
be studied on your TS computer.

The CHAOS equation I've selected here
was used by biologist Robert May in the
study of fish populations in a pond.
x=rx(1l-x) where x is a stable fish
population for r which is the food
supply.

(What we are looking at here is the

equation. Using fish is just an example).

Lines 110 and 140 of the TS1500 Program
set the initial value of x and then re-
calculate x 200 times to stabalize it.
Next, x is calculated 300 more times and
is plotted against values of r. The
result is shown in Figure 1.

In the CHAOS region from r=3 to 4, x may
have one of two values, four values, or
even any value between two fixed limits.

TS150@ PROGRAM CHAOS

_108@ FOR R=2.95 TO 4 STEP .@1666

1 TO 282
REX¢(1-X)
Ae

i

TO 30a
16@ LET X=R#x#(1-x)
17@ PLOT ee et ee ee

230 LET x

3 ca

Figure 1. TS1500 CHAOS

447

by Bob Orrfelt

The TS1500 Program takes about 15 minutes
to run.

To convert. the TS1500 program to a TS2068
program just eliminate the FAST and SLOW
and change the STEP and PLOT. RUN this
and you get Figure 2 - the same thing but
with more detail.

The figure has Mandelbrot properties. It
can be magnified indefinitely and similar
figures will appear.Sequences of 3, 6, 9
and even 7, 14, 28 can be found. The
Sinclair BASIC calculates to 8 places
giving plenty of accuracy for magnifi-
cation.

TS2868 PROGRAM CHAOS
2 LPRINT " TS2068 PROGRA
H :

1@ FOR r=2.95 TO 4 STEP .@G4

Ta 20a
4@ LET M=Ce*xe(1l-x)

6@ FOR iz=i TO 300

7@ LET x=rexeti-x)

8@ PLOT (e5@0er-745! ,17Ssez
S@ NEXT i

ba a
112 LPRINT > LPRINT

3 (Ri a
Figure 2. TS2068 CHAOS.

Instead of magnifying the figure, let's
back off and look at the whole figure.
For values of r beyond 4 x may become
negative and has no meaning. The
possible value of r then is from 0 to
4. A STEP of 1/64 will give us 256
points to PLOT. The PLOT scale must be

ie a oT Ieee ee

IMELIRE? a a

TS CHAOS by Bob Orrfelt

adjusted so the figure will fit on the
screen,

ing with the initial condition x=.3.
Notice the first generation forms a
diagonal straight line.

|
|
Using the fish example, for r=0 TO 1 the
population crashes (no fish). From 1 TO |
3 the population increases with the food
supply. From 3 to 4 is CHAOS. In the |
CHAOS region the fish population will
change from year to year. The wildest
swings will be at r=4.

1

|

\

TS2068 PROGRAM CHAOS

2 LPRINT “" TS2e6s PROGRA
M@ CHAOS"

4 T
S-LLISt
1@ FOR r=@ TO 4.095 STEP il-vd4d

20 LET x=.3
3@ FOR i=i TO 208
4@ LET x=rf#xzti-x)

5@ NEXT i ae

6@ FOR i=1 TO 300 eel ;
7@ LET x=rexeti-x) ee | (R) a
8@ PLOT (63.754r) ,x#175 ieee

9@ NEXT i :

10@ NEXT & Figure 4. All generations.

11@ LPRINT :- LPRINT : 3 ; ;

128 COPY Figure.5..is a: pilot of-1-vser.. This

4
124 LPRINT " tRi to settle down to one, two, or four
126 LPRINT : LPRINT : LPRINT | values. If i is 175 or larger it is

plotted on the top line.

— ee

H
|
Y
pea mbes 2. 1 e shows the number of generations it takes
i
i
{
i

Lo]
Le .
fu

Figuee-3. Complete plot: Figure 5. Number of generations.

What can we learn from all this? Check-
ing r=4 we find the 507th generation is
99.999994% of maximum and the 508th
generation goes to 0.000025%. But after
all it is only an equation.

Figure 3 shows the complete plot of the
equation for values of r=0 TO 4.

So far all these plots have been for a
"stable population.'"' The first 200
generations have been discarded. Figure

4 shows the first 200 generations start- | (See Scientific American July '87 pg 108)

rey
i)
-.

IMELINEZ

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ATTEND.

HAPPY COMNPUTIHG...... THE EDITORS

Deere ne a
NANE:

ABBRESS:

5 (a ee ef ee

PHEKE: WERKE:
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ray 6, 13, 20, 27, 1989

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nay 24, 1989

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BATES:

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MARCH 19, 1389
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may 21, 1989

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BILL AILLER

LEST GEBRESBAY GF EGCH MONTH - 7:36
COPERTING LIBEREY E

{
| BORN
10460 TORRE BVEMUE | LERDING 16 BUTTE" SF
CUPERTING, CA 95814 | CTRCELER BBILBIKE

MARCH 29, 1989
APLIL 26, 1989
maY 31, 1989

TAS-BR, TRC. RAPA BND SURCORST BAY AREA MICEO-

COMPUTER GSERS* GROG, Int.
5956 46TH AVENUE NORTE
SAINT PETERSBORE, FL 33769
(813) 346-4278

GEORGE FEATHERTAN

SECOMD SATURDAY OF EACH MONTH, 7:30 PAN.
BEACH FEDERAL SWUINCS AAD LOAN

7777 WORTH SEMIKOLE BLOB.

SEMINOLE, FL

MARCH 11, 1989
BPRIL &, 1995
fay 13, 1989

IMELINEZ

bbe
OMPUTER | |
See

NHETUGRE — What a fisherman does
when he's mot fishing.

OFFICE INFORMATION SYSTEM — The
word processor who knows the
moct gossip.

OHM -— Where the ‘Eart is!

OUTPUT DEVICE — A word proces—
sor who can't say "NO!"

PLASMA DISPLAY -— A bloody nose.

PROGRAM - A random callectian
of Buas.

RERD/-URITE HEAD - Men’ s room
with a graffiti wall. oe)

RUHKRING HEAD — One which needs
the handle jiagted. ,

SILICGH - A foolish prisoner.

SKEW — Interface betueen
comsenting commuters.

SEEUW FAILUEE — Premature calcu-
lation.

SOQFIT@REE — What hackers wear
under theie hoarduare.

SOFTUARE STGRE — Frederick's of
Hol buwood.

fa AER Ns oR DS cS SAMS 1 fe elena at © sala aut nalh mee Ste SDPO IND ONG Ine Rete) ea ete IM

AMERICAN MICRO SYSTENS
2173 ABORN ROAD #262
SAN JOSE, CA 95121

STANDARD OPERATING PROCEDURE —

| The wou mobody does it.

TAPE PUHCH — A non-alcoholic
drink that comes on a roll and
sticks to your fingers.

TELEPACK — A brevery that deliv—
ers.

TERMINAL INTELLIGENCE — To be soa
smart it kills you!

Here are some “cookies” that I pulled off of a BBS years ago.
They wight be usefull in filling small spaces in TIMELINEZ. J
hope they can be of use. .secseees eran LT Ti Suenson

Digital circuits are made from analog parts.

-finy IC protected by a fst acting fuse vill protect the fuse bu
bloving first.

Give: Support the helpless victies of computer error.

“Shift te the left, shift to the rioht, mask in, mask cut, Bute,
Bute, Byte.

-Your proaram is sick! Shoot it and put it out of its memory.
-Every interesting Progr aie has at least one variable, one branch,
Gd OPE lOO seeeceeesent And at least one bus!

“If it works) Don't fix iti

Hoy ofl your PiSHes be POPed.

-Ie qmticen tering! @ rester-farian?
-Basic‘is a high-level languish.

-Constonts aren't: variables don't.

“Computer proaromeers never die, they just get lost in the

cna # disk you can seek forever, 7
-l'm all for computer dating;
¥ t one te marry
a Teabees cee ile.
eee i,
as of venwruty topey~thee-peexr ait ~~
tting theming”

ital ey

“Recursive, adrry ett Recursive.
cilhon computers uouid destroy, they must first drive insane,
(i programmers vant arrays.

FIRST CLASS MAIL

we nothing te Geet ETE Ripe

anal

ell

Shen eae